Fix borrowed GrVkImage::Resource.

src/gpu/vk/GrVkImage.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrVkImage_DEFINED
 #define GrVkImage_DEFINED
 
@@ skipping 23 matching lines @@
         Resource(VkImage image, VkDeviceMemory alloc, Flags flags)
             : fImage(image), fAlloc(alloc), fFlags(flags) {}
 
         ~Resource() override {}
     private:
         void freeGPUData(const GrVkGpu* gpu) const override;
 
         typedef GrVkResource INHERITED;
     };
 
+    // for wrapped textures
+    class BorrowedResource : public Resource {
+    public:
+        BorrowedResource(VkImage image, VkDeviceMemory alloc, Flags flags)
+            : Resource(image, alloc, flags) {}
+    private:
+        void freeGPUData(const GrVkGpu* gpu) const override;
+    };
 
     GrVkImage(const Resource* imageResource) : fResource(imageResource) {
         if (imageResource->fFlags & Resource::kLinearTiling_Flag) {
             fCurrentLayout = VK_IMAGE_LAYOUT_PREINITIALIZED;
         } else {
             fCurrentLayout = VK_IMAGE_LAYOUT_UNDEFINED;
         }
         imageResource->ref();
     }
 
@@ skipping 45 matching lines @@
     void releaseImage(const GrVkGpu* gpu);
     void abandonImage();
 
     const Resource* fResource;
 
     VkImageLayout   fCurrentLayout;
 
 };
 
 #endif